$ wget -nv http://download.sourceforge.net/project/libusb/libusb-1.0/libusb-1.0.18/libusb-1.0.18-win.7z
$ 7z -olibusb-1.0.18-win x libusb-1.0.18-win.7z
$ wget -nv http://win32.libav.org/releases/libav-9.13-win32.7z
- $ 7z -olibav-9.13-win32 x libav-9.13-win32.7z
+ $ 7z -olibav-9.13-win32 x libav-9.13-win32.7z
$ cmake \
-D GNU_HOST=i686-w64-mingw32 \
-D CMAKE_TOOLCHAIN_FILE=../cmake_modules/mingw_cross_toolchain.cmake \